Installing Mongo database on Linux

I was trying to learn basics of using Mongo database recently. I am capturing some of the things I learnt below so it will be helpful for other people.

Installing Mongo database on Linux:

First lets intall Mongo db. I use a Ubuntu OS laptop. Below are steps to follow to install Mongo -

• In Linux, it is better to use the package manager to install software. In Ubuntu, we can use the apt commands to install mongo
• To ensure authenticity of the package that needs to be installed, Ubuntu requires packages be signed with GPG keys. As a first step, let us download the key from ubuntu.com.

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927 

 

• Next we will need to add the repository for mongo in the list of sources for your ubuntu laptop. I will do that by creating a list file for mongo -

 echo "deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list

• Next keep the ubuntu package database updated

 sudo apt-get update

• now lets install mongo. Install the latest version always unless you have a specific reason to use an older version

 sudo apt-get install -y mongodb-org

 

• Now this installs mongodb in your Ubuntu. To start Mongo services, in a terminal window, type - mongod . This will start mongo services with port 27017
• To log into mongo shell and query the database, in another terminal type - mongo

Now, lets look at some useful commands to know while working with a mongo database -

•  show dbs

this shows all available databases present

• use <db name>

 this switches to the appropriate database you specified

• show collections

this command shows all collections in the database

• db.<collection>.find()

this command shows all documents within the collection you specified.

• db.<collection>.insert({"test":"123"})

this command inserts a document into the collection with the json data i specified.

There are many more commands to learn -  db.<collection>.update, etc

At least hopefully this will get you started. Enjoy!